Abstract

In this study, a new and efficient magnetic composite was synthesized based on graphene oxide (GO). Initially, GO was coated with magnetite, and then Ti^(IV) was fixed on GO-Fe₃O₄ via a covalent graft. The magnetic composite was characterized by FT-IR, EDS, XRD, FE-SEM, TEM, VSM and TGA techniques. It was designed as a compound with strong and recoverable catalytic properties. The prepared GO-Fe₃O₄-Ti^(IV) emerged to be of high catalytic activity for the synthesis of bis(indolyl)methane and benzo[a]xanthen-11-one derivatives under mild conditions. The stability and reusability of the catalyst were investigated too. All of the data proved that GO-Fe₃O₄-Ti^(IV) could be recycled five times without a marked loss of activity.

摘要

在这项研究中，基于氧化石墨烯（GO）合成了一种新型高效的磁性复合材料。最初，GO 被磁铁矿包覆，然后 Ti ^{(IV )}通过共价接枝固定在 GO-Fe ₃ O ₄ 上。通过FT-IR、EDS、XRD、FE-SEM、TEM、VSM和TGA技术对磁性复合材料进行了表征。它被设计为一种具有强大和可恢复催化性能的化合物。制备的 GO-Fe ₃ O ₄ -Ti ^(IV)对双（吲哚基）甲烷和苯并[a]的合成具有较高的催化活性温和条件下的 xanthen-11-one 衍生物。还研究了催化剂的稳定性和重复使用性。所有数据都证明 GO-Fe ₃ O ₄ -Ti ^(IV)可以循环使用五次而没有明显的活性损失。